Operation - Extech Instruments HD300 User Manual

Operation

Air Velocity Measurements
1. Connect the sensor to the sensor input jack on top of the
meter.
2. Turn ON the meter using the on-off
3. Select the VELOCITY function using the UNITS button.
Press the button repeatedly until the LCD displays VEL.
4. Press and hold the UNITS button for 2 seconds (until two
tones are heard) to change the temperature units from °C
to °F or from °F to °C. The LCD will reflect the selection.
5. Select the desired air velocity units using the UNITS
button. The LCD will reflect the selection.
6. Place the sensor in the air current to be measured with the
arrow on the inlet side of the vane (see diagram).
7. View the air velocity and temperature readings on the LCD
Display.
Air Flow (Volume) Measurements (CFM / CMM)
1. Connect the sensor to the sensor input jack on top of the meter.
2. Turn on the meter using the on-off
3. Select the FLOW mode using the UNITS button. Press the button repeatedly until the LCD
displays FLOW CFM (cubic feet per minute) or FLOW CMM (cubic meters per minute) as
desired.
4. Measure the dimensions of the duct or vent in question and calculate the area in square feet or
square meters
Note: If the dimensional measurements are made in inches (or cm), convert them feet (or meters)
before calculating the square area.
5. To begin entering the area in m
(until two tones are heard).
6. Momentarily press the NEXT button to select the desired memory location to store the area
value (there are eight locations).
7. Use the
another digit, and use the
8. Press and hold the AREA button for approx. 2 seconds (until two tones are heard) to save the
area value in memory.
9. Place the sensor in the air current to be measured with the symbol on the inlet side of the
vane.
10. View the air flow and temperature readings on the LCD Display.
11. If the CFM or CMM reading exceeds 9999, the display will show the X10 or X100 multiplier in
the lower right hand corner of the LCD indicating that the displayed value must be multiplied by
10 or 100 to arrive at the correct flow measurement value.
2
or ft
button to change the value of the flashing digit, use the
button to move the decimal point.
button.
button.
2
press and hold the AREA button for approx. 2 seconds
4
Side view of Vane
Arrow
airflow
button to select
HD300-EU-EN V2.2 07/13